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The DC pin on your laptop is bent/broken/loose. Look at where your power adapter plugs in on your laptop. Get a paper clip, bend it out to make a long paper clip and slightly push its tip on the pin inside your laptop. If the pin moves chances are either the DC pin needs to be soldered down or needs to be replaced. The part is usually cheap around $10 but the labor can cost more than $50.

what OS, what operating system.
KVM are very unreliable. , we could talk KVM for days, on this.
no KVM evens stated, brand or model number.
dock ,circa 2008, compatible with V6000
what OS on v6000.
we can not guess what OS you are running, at all.

its a USB problem with the KVM.
V6000 is a 2006 product..
that came with XP or VISA, neither are supported now.
the V6000 must have all its HP drivers installed to work right.
no KVM is guaranteed to work here, with XP its real bad.
XP has bad USB drivers, that are infamous for not working
with odd USB devices, nor many other things,
got SP3 for XP, IF XP>? it fixes some of that be never all.

There is a hardware problem with the laptop that is why the screen is black. Take a good look at the screen with light reflected on it, to see if it looks in any way damaged or have some kind of ink on the screen, if you do not see any of the two, then it simply means the module of the laptop is faulty.

The module acts like a flex on the laptop, if the laptoo hits a hard object or falls or have a heavey load placed on it, then, the module can develop some fault.

First, it starts to flicker, then it shows some horizontal lines, then it goes blank once in a while, sometimes it remains stable, and later on, the screen does not come on at all while other parts remain functional.

Try to have a repairman replace the module of the laptop and it will be in good condition once again.

For the main time, you can use a external monitor or a lcd television. To use this, check your lcd television if it has the RGB(PC) port at the back, then you get the cable that connects a CPU to the monitor, and connect it into the printer port on the laptop and connect to the RGB(PC) on the lcd television.

After connecting, your television will serve as the screen. And you will enjoy your laptop from the lcd.

There was a TSB about the motherboards on the V series describing severe video issues and Nvidia GPU failures. Many consumers got a motherboard replacement. Try using a laptop cooler in the meantime and see if that helps a little. Also try googling V6000 video and see how many others got nuked by this poor design.

first, locate the bigger hose that comes out of your compressor that goes to your firewall towards the evaporator, that is the suction hose. look for some fittings that comes out of that pipe and covered by a plastic cap. that is the pressure port where you can add freon.

HP has identified a hardware issue with certain HP Pavilion
dv2000/dv6000/dv9000 and Compaq Presario V3000/V6000 series notebook
PCs, and has also released a new BIOS for these notebook PCs, version
F.39 for dv2000/V3000, and version F.3D for dv6000/dv9000/V6000.